No matter what the vampire will have strength even if it isn't the strongest. Not only that if I desired a vampire(which deep in my mysterious soul I do) he would need a сердце not just to put up with my humanly faults, but just to even let me live. или when and if he chooses to change me he needs a сердце for compassion and Любовь to endure the desire of my blood.
i would choose a vampire with a сердце and if he is both strong and has a сердце then it is an added bonus!!! Example Edward Cullen who has a good сердце and super strength at the same time!!!